As with the previous developer previews, the fourth developer build continues to address various bugs and add performance enhancements ahead of the public release of OS X Mavericks. The update weighs in at 1.72GB is available through the Mac App Store on machines that already have a previous Mavericks preview installed. The update weighs in at 1.27GB.

OS X Mavericks is staled for public release later this fall, and boasts over 200 new features.

J. Glenn Künzler

Glenn is Managing Editor at MacTrast, and has been using a Mac since he bought his first MacBook Pro in 2006. Now he's up to his neck in Apple, and owns an old iBook, a 2012 iMac with an extra Thunderbolt display for good measure, a 4th-generation iPad, an iPad mini, 2 iPhones, and a Mac Mini that lives at the neighbor's house. He lives in a small town in Utah, enjoys bacon more than you can possibly imagine, and is severely addicted to pie.